Attachment for electrical furnaces.



No. 367,542. PATENTE) 0GT., 1907. S. M. WEAVER n W. AMBLER.

ATTACHMENT POR ELECTRICAL FURMGESl APPLIOTIOH FLEB SEPT. 2Q, i905.

UNITED STATES PATENT OFFICE.

ATTACHMENT FOR ELECTRICAL FURNACES.

Specification of Letters Patent.

Patentes oct. 1,1907.

Application tiled September 29,1905. Serial No. 280,598.

To all who/lt it may concern:

Be it known that we, SAMUEL M Wrinvnn and WIL man AMBLER, residing atCleveland, in the county of 'uyahoga and State oi Ohio, have inventedcertain new and useful Improvements -in Attachments `i`or ElectricalFurnaces, ci which the followingis s. full, clear, and exactdescription, reference being had to the accompanying drawings.

This invention relates to attachments for use in connection withelectrical furnaces employed by dentists i in baking porcelain fillingsfor crown and bridge work,

and is especially designed to be used with a thermopile, I,

More specifically the invention contemplates the use of an attachment torest upon the bracket in iront of 4 the door of an electrical furnace,and provided with a thermo-pile adapted to project into the same, 'andwhen heated to generate a current which can be measured by any suitabledevice, and thus obtain a means for vdetermining the amount of heatwithin the furnace. I

All of this construction is old and well known `in the art butt-here arenumerous disadvantages associated furnace where the porcelainis located.

with this system due to the fact that the temperature in the furnace atthe endsof couples of the thermopile may not be the temperature of thatportion of the This is espe- .cially true when the thermo-pile isremovable,l since V some'variationfin the extent l practical way ofinsuringthe placing of the porcelain i' supporting the entire mechanismwhen it is withdrawn and again insertedthere may b'e to which it isinserted, and hence the reading of the measuring device wouldnotcorrectly indicatel the heat which is acting upon the porcelain onaccount of the change in the relative Or in the case where thethermoe'xactly urrderv the couples especially when it Vis removed forinspection or for any other' cause such as cooling for the purpose ofmaintaining it at substantially a constant temperature. 40

Itis the object of this invention therefore to arrange inconjunctionwith a removable thermo-pile, 'a pari or tray which has afixed relationship with respect to the same whereby the piece ofporcelain maybe placed in position with respect to the thermo-pile andcan be re- A,tained-inthis position throughout the entire baking 'Theinvention also relates to a suitable device for in such a manner thatthe panand the thermopiles may be readily swung the furnace and whenremoved may be handy for The invention may be further briefly summarizedas consisting in the construction and combination of parts hereinafterset forth in the following description, draw ings and claims. v

' Referring to the drawings Figure 1, represents a side Afire clay 7,and through.this and `ends of the couples,

as to project the .into the iire place Where the filling can bethorelevation of an electrical furnace with the thermo-pile swung out ofthe same; Fig. 2 is a vertical section through the center oi' thedevice; Fig. vation, partly in section, oi ay modified form of the device7 and Fig. d is a side elevation or the same.

Any preferred form and construction or electrical furnace andthermo-pile attachment may be employed in the *carrying out oi mypossess the necessary characteristics, but we have shown one form in thedrawings which very effectively meets the requirements, and in suchembodiment l represents a furnace having a suitable iire place 2, shownin dotted lines in Fig. l, and opening out at the front. The furnace l,is provided just -at the entrance to the fire place with a bracket 3,for supportingwork or tools as the case may be. The front of the furnaceis further provided with a bearing bracket 4, as shown, to which issecured a pin 4, having pivoted to it a. swinging arm 5, provided with ahandle 5, and adapted to support the thermo-pile attachment. I

The thermo-pile attachment consists of the casing 6 l provided upon itsback with a suitable opening 6, which receives the arm 5.

A thumb screw 6", screwing into the casing is arranged to take againstthe arm 5,

,and hold `the same in any adjusted position. The casing 6, ispreferably made hollow and is Vpacked with I the casing 6, project thethermofcouples 8, of ordinary construction. These couples 8', extend outfrom the front of the face of the fire clay portion as shown. Near tlmbase of the casing 6,1 the tire clay portion 7, is provided with arecess 7"', for the purpose oi receiving the en'd of a tray or pan 9,which projects out beyond the same under the active whereby any thingplaced upon .the pan. 9, Will be under the thermo-couples. Screws 9",threaded into the casing 6, pass through the fire clay portion andengage the pan for the purpose oi holding l the same rigidly in thecasing.

It will bel seen from the foregoing that the porcelain lillinggor otherarticle, may be placed upon the pan 3 is a front ele.

invention so long as they under the thermo-couples, and the arm 5, beswung so i pan, work and the thermo-couples oughly baked and the amounto-heat acting upon .the same can be kept constant by means ofanysuitable measuring device connected to the thermo-pile lwhich willindicatevthe amount of current generated by it. VShouldthe measuringdevice indicate too great a current, or a lcurrLent whichk is consideredsullicient to impair the pigments in the iilling, the arm 5, may beswung upon its pivot and the filling may be allowed to cool in the openair. Aitor the filling has cooled sufficientlyit may again be insertedin the fire .place to finish the baking.

In the modiiication shown in Figs. 3 and ll, thecasing 10, is providedwith an opening at the bottom to receive the pan or tray ll, and theedges of the casing at the opening are inclined as shown at l2, for thepurpose of receiving the devctailed portion of the tray. By thisconstruction it will bc seen that the tray may be slid into the openingin the bottom of the casing and l willlie firmly held therein bythelncllned sides and the dovctailed construction of the pan. In this emlbodiment the casing is also provided with a springr clip 13, adapted totake under the bracket of the furnace and r4-0 hold thedevicein-placc. Ahandle 14, is secured to the rear -side 'of the easing and thethermo-couples are arranged to pass through it.

Having described our invention we claimz- 1. In an attachment for afurnace, the combination with 1 5 a thermo-pile, of means forsupportinay the work in a fixed relationship thereto.

2. In an attachment for a furnace, the combination with a heutindicatingr device. of means for Supporting.; the work in av fixedrelationship thereto.

Ii. In an attachment for anelcctrieal furnace the combination with athermo-pile, of means for supporting thev work in a fixed relationshipthereto.

4. In a furnace, the combination with an arm Apivotcd thereto, of meansfor indicating the lgcat in said furnace and mounted upon said arm, andmeans also carried l'ayl :said` arm for holdin),r the work ina lixedrelationship with respect to said indicating,r means.l

T. In a furnace, the combination with an arm pivoted thereto, of athcrmopile carried by said arm, and means workl in a fixed relationshipto said a thermo-pilennd means carried thereby for supporting the workin a fixed relationship thereto.

7. In an attachment for an electrical furnace, the combi.- nation withthe casing, of a tire clay portion carried thereby, thermo-couplesmounted in said lire clay portion, and means carried thereby forsupporting,r the work in a fixed relationship to said thermo-couples.

H. In an attachment for an electrical furnace, the combination with thecasing, of thermo-couples carried thereby, and a pan mounted in saidcasing for supporting the work in a tired relationship to said couples.

Si. In an attachment for an electrical furnace, the combination with thecasing, of a lire clay portion carried by said casing, thermo-couplesprojecting from the face of said lire clay portion, a pan carriedthereby und adapted to support the work in a lixed relationship to saidcouples.

1l). In an attachment fornn electrical furnace, the comhination with theeasing, of a tire clay portion within said cas-ine; and provided with areces, thermo-couples projectinf,r from the face of said tire clayportion, a pan mounted in said recess, and set screws for holding thesame in place.

In testimony whereof we affix our signatures in the pres ence of twowitnesses.

Il. W. Dnociih'r'r,

